engine miss at normal run speeds on 1996 Dodge Ram Van 2500

Engine miss or stutter at cruising speed. (5.9L w/electric auto/OD trans) Pulls good under hard acceleration. Condition shows up when engine is warmed up. Runs good when cold. Possible ignition module? Had similar problem on 92 Chevy van 5.7. Replace ignition mod, no problem.

Asked by for the 1996 Dodge Ram Van 2500
Your car has On Board Diagnostics (OBD2). Is the Check Engine/Service Engine soon Light on? If so plugging in a scan tool and looking at codes and freeze frame data would help locate the problem. If the light is not on a professional grade scan tool will be able to read live sensor data rather than have to intrusively test the many engine sensors to see which one may be out of range.
Check engine light not on. Does not come on when starting either. Think it may be disconnected. Just got the van within last couple on months, so have not found all problems yet. Thanks for the advice.